Ink cartridge for a printer



FIG. 1 is a perspective view of an ink cartridge for an printer that shows our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a top plane view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom plane view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for an ink cartridge for a printer, as shown and described. 